src/libpcp/src/auxserver.c: tweak EADDRINUSE diagnostics
src/libpcp/src/auxserver.c: tweak EADDRINUSE diagnostics

The recent change to add a "try 4 times before really reporting EADDRINUSE"
to overcome some race-in-QA situations was a bit too chatty (and caused
qa/243 to fail), so move the reporting of each failed attempt inside a
conditional, guarded by DBG_TRACE_DESPERATE.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp